SwePub
Sök i SwePub databas

  form:Ext_t

Träfflista för sökning "db:Swepub ;srt2:(2010-2011);lar1:(umu);lar1:(his)"

form:Search_simp_t: db:Swepub > (2010-2011) > swepub_uni:Umu_t > swepub_uni:His_t

  • navigation:Result_t 1-10 navigation:of_t 13
hitlist:Modify_result_t
   
hitlist:Enumeration_thitlist:Reference_thitlist:Reference_picture_thitlist:Find_Mark_t
1.
  • Billing, Erik, 1981-, et al. (creator_code:aut_t)
  • A formalism for learning from demonstration
  • 2010
  • record:In_t: Paladyn - Journal of Behavioral Robotics. - : De Gruyter Open. - 2080-9778 .- 2081-4836. ; 1:1, s. 1-13
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The paper describes and formalizes the concepts and assumptions involved in Learning from Demonstration (LFD), a common learning technique used in robotics. LFD-related concepts like goal, generalization, and repetition are here defined, analyzed, and put into context. Robot behaviors are described in terms of trajectories through information spaces and learning is formulated as mappings between some of these spaces. Finally, behavior primitives are introduced as one example of good bias in learning, dividing the learning process into the three stages of behavior segmentation, behavior recognition, and behavior coordination. The formalism is exemplified through a sequence learning task where a robot equipped with a gripper arm is to move objects to specific areas. The introduced concepts are illustrated with special focus on how bias of various kinds can be used to enable learning from a single demonstration, and how ambiguities in demonstrations can be identified and handled.
  •  
2.
  • Billing, Erik, 1981-, et al. (creator_code:aut_t)
  • Behavior recognition for learning from demonstration
  • 2010
  • record:In_t: 2010 IEEE International Conference on Robotics and Automation. - : IEEE. - 9781424450404 - 9781424450381 ; , s. 866-872
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • Two methods for behavior recognition are presented and evaluated. Both methods are based on the dynamic temporal difference algorithm Predictive Sequence Learning (PSL) which has previously been proposed as a learning algorithm for robot control. One strength of the proposed recognition methods is that the model PSL builds to recognize behaviors is identical to that used for control, implying that the controller (inverse model) and the recognition algorithm (forward model) can be implemented as two aspects of the same model. The two proposed methods, PSLE-Comparison and PSLH-Comparison, are evaluated in a Learning from Demonstration setting, where each algorithm should recognize a known skill in a demonstration performed via teleoperation. PSLH-Comparison produced the smallest recognition error. The results indicate that PSLH-Comparison could be a suitable algorithm for integration in a hierarchical control system consistent with recent models of human perception and motor control.
  •  
3.
  • Billing, Erik, 1981- (creator_code:aut_t)
  • Cognitive Perspectives on Robot Behavior
  • 2010
  • record:In_t: Proceedings of the 2nd International Conference on Agents and Artificial Intelligence. - Portugal : INSTICC. - 9789896740214 ; , s. 373-382, s. 373-382
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • A growing body of research within the field of intelligent robotics argues for a view of intelligence drastically different from classical artificial intelligence and cognitive science. The holistic and embodied ideas expressed by this research promote the view that intelligence is an emergent phenomenon. Similar perspectives, where numerous interactions within the system lead to emergent properties and cognitive abilities beyond that of the individual parts, can be found within many scientific fields. With the goal of understanding how behavior may be represented in robots, the present review tries to grasp what this notion of emergence really means and compare it with a selection of theories developed for analysis of human cognition, including the extended mind, distributed cognition and situated action. These theories reveal a view of intelligence where common notions of objects, goals, language and reasoning have to be rethought. A view where behavior, as well as the agent as such, is defined by the observer rather than given by their nature. Structures in the environment emerge by interaction rather than recognized. In such a view, the fundamental question is how emergent systems appear and develop, and how they may be controlled.
  •  
4.
  • Billing, Erik, 1981-, et al. (creator_code:aut_t)
  • Model-free learning from demonstration
  • 2010
  • record:In_t: ICAART 2010 - Proceedings of the international conference on agents and artificial intelligence. - Portugal : INSTICC. - 9789896740221 ; , s. 62-71
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • A novel robot learning algorithm called Predictive Sequence Learning (PSL) is presented and evaluated. PSL is a model-free prediction algorithm inspired by the dynamic temporal difference algorithm S-Learning. While S-Learning has previously been applied as a reinforcement learning algorithm for robots, PSL is here applied to a Learning from Demonstration problem. The proposed algorithm is evaluated on four tasks using a Khepera II robot. PSL builds a model from demonstrated data which is used to repeat the demonstrated behavior. After training, PSL can control the robot by continually predicting the next action, based on the sequence of passed sensor and motor events. PSL was able to successfully learn and repeat the first three (elementary) tasks, but it was unable to successfully repeat the fourth (composed) behavior. The results indicate that PSL is suitable for learning problems up to a certain complexity, while higher level coordination is required for learning more complex behaviors.
  •  
5.
  • Billing, Erik, 1981-, et al. (creator_code:aut_t)
  • Predictive learning from demonstration
  • 2011. - 1
  • record:In_t: Agents and artificial Intelligence. - Berlin : Springer Verlag. - 9783642198892 - 9783642198908 ; , s. 186-200
  • swepub:Mat_chapter_t (swepub:level_refereed_t)abstract
    • A model-free learning algorithm called Predictive Sequence Learning (PSL) is presented and evaluated in a robot Learning from Demonstration (LFD) setting. PSL is inspired by several functional models of the brain. It constructs sequences of predictable sensory-motor patterns, without relying on predefined higher-level concepts. The algorithm is demonstrated on a Khepera II robot in four different tasks. During training, PSL generates a hypothesis library from demonstrated data. The library is then used to control the robot by continually predicting the next action, based on the sequence of passed sensor and motor events. In this way, the robot reproduces the demonstrated behavior. PSL is able to successfully learn and repeat three elementary tasks, but is unable to repeat a fourth, composed behavior. The results indicate that PSL is suitable for learning problems up to a certain complexity, while higher level coordination is required for learning more complex behaviors.
  •  
6.
  • Billing, Erik, 1981-, et al. (creator_code:aut_t)
  • Simultaneous control and recognition of demonstrated behavior
  • 2011
  • swepub:Mat_report_t (swepub:level_scientificother_t)abstract
    • A method for Learning from Demonstration (LFD) is presented and evaluated on a simulated Robosoft Kompai robot. The presented algorithm, called Predictive Sequence Learning (PSL), builds fuzzy rules describing temporal relations between sensory-motor events recorded while a human operator is tele-operating the robot. The generated rule base can be used to control the robot and to predict expected sensor events in response to executed actions. The rule base can be trained under different contexts, represented as fuzzy sets. In the present work, contexts are used to represent different behaviors. Several behaviors can in this way be stored in the same rule base and partly share information. The context that best matches present circumstances can be identified using the predictive model and the robot can in this way automatically identify the most suitable behavior for precent circumstances. The performance of PSL as a method for LFD is evaluated with, and without, contextual information. The results indicate that PSL without contexts can learn and reproduce simple behaviors. The system also successfully identifies the most suitable context in almost all test cases. The robot's ability to reproduce more complex behaviors, with partly overlapping and conflicting information, significantly increases with the use of contexts. The results support a further development of PSL as a component of a dynamic hierarchical system performing control and predictions on several levels of abstraction. 
  •  
7.
  • Eriksson, Irene, 1965-, et al. (creator_code:aut_t)
  • Do urinary tract infections affect morale among very old women?
  • 2010
  • record:In_t: Health and Quality of Life Outcomes. - : Springer Science and Business Media LLC. - 1477-7525 .- 1477-7525. ; 8, s. 73-
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • As UTI seems to be independently associated with low morale or poor subjective wellbeing, there needs to be more focus on prevention, diagnosis and treatment of UTI in old women.
  •  
8.
  • Eriksson, Irene, 1965-, et al. (creator_code:aut_t)
  • Prevalence and factors associated with urinary tract infections (UTIs) in very old women
  • 2010
  • record:In_t: Archives of gerontology and geriatrics (Print). - : Elsevier BV. - 0167-4943 .- 1872-6976. ; 50:2, s. 132-135
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The aim of this study was to describe the prevalence of urinary tract infection (UTI) and associated factors among very old women. In a cross-sectional, population-based study in Sweden and Finland, 532 women were asked to participate and 395 (74.2%) were possible to evaluate for UTI. Data were collected from structured interviews and assessments made during home visits, from medical charts, caregivers and relatives. UTI diagnosis documented in medical records during the preceding 1 and 5 years was registered. About one-third (117/395, 29.6%) were diagnosed as having suffered from at least one UTI in the preceding year and 60% in the preceding 5 years. In a multivariate logistic regression model, UTI in the preceding year, was associated with vertebral fractures (odds ratio (OR) = 3.2; 95% confidence interval (95% CI) = 1.4-7.1), incontinence (OR = 2.8; 95% CI = 1.8-4.5), inflammatory rheumatic disease (OR = 2.8; 95% CI = 1.4-5.7) and multi-infarct dementia (OR = 2.4; 95% CI = 1.3-4.5). UTI is a major public health problem in very old women and were independently associated with vertebral fractures, urinary incontinence, inflammatory rheumatic disease and multi-infarct dementia which might indicate that UTI is not a harmless disease.
  •  
9.
  • Eriksson, Irene, 1965- (creator_code:aut_t)
  • Urinary tract infection : a serious health problem in old women
  • 2011
  • swepub:Mat_doctoralthesis_t (swepub:level_scientificother_t)abstract
    • Urinary tract infection (UTI) is a common bacterial infection in women of all ages but the incidence and prevalence increase with age. Despite the high incidence of UTI, little is known about its impact on morale or subjective wellbeing and daily life in old women. UTI in older people can be a complex problem in terms of approach to diagnosis, treatment and prevention because in these patients it frequently presents with a range of atypical symptoms such as delirium, gastrointestinal signs and falls. Even if UTI has been shown to be associated with delirium it has frequently been questioned whether UTI can cause delirium or if it is only accidentally detected when people with delirium are assessed. The main purpose of this thesis was to describe the prevalence of UTI, to identify factors associated with UTI among very old women and to illuminate the impact of a UTI on old women’s health and wellbeing.  This thesis is based on two main studies, the GErontological Regional DAtabase (GERDA) a cross-sectional, population-based study carried out in the northern parts of Sweden and Finland during 2005-2007 and a qualitative interview study in western Sweden 2008-2009. Data were collected from structured interviews and assessments made during home visits, from medical records, care givers and relatives. UTI was diagnosed if the person had a documented symptomatic UTI, with either short- or long-term ongoing treatment with antibiotics, or symptoms and laboratory tests judged to indicate the presence of UTI by the responsible physician or the assessor. One hundred and seventeen out of 395 women (29.6%) were diagnosed as having suffered from at least one UTI during the preceding year and 233 of these 395 (60%) had had at least one diagnosed UTI during the preceding 5 years. These old women with UTI were more dependent in their activities of daily living, and had poorer cognition and nutrition. In these women, UTI during the preceding year was associated with vertebral fractures, urinary incontinence, inflammatory rheumatic disease and multi-infarct dementia. Eighty-seven of 504 women (17.3%), were diagnosed as having a UTI with or without ongoing treatment when they were assessed, and almost half (44.8%) were diagnosed as delirious or having had episodes of delirium during the past month. In all, 137 of the 504 women (27.2%) were delirious or had had episodes of delirium during the past month and 39 (28.5%) of them were diagnosed as having a UTI. Delirium was associated with Alzheimer’s disease, multi-infarct dementia, depression, heart failure and UTI. Forty-six out of 319 women (14.4%) were diagnosed as having had a UTI with or without ongoing treatment and these had a significantly lower score on the Philadelphia Geriatric Center Morale Scale (PGCMS), (10.4 vs 11.9, p=0.003) than those without UTI, indicating a significant impact on morale or subjective wellbeing among very old women. The medical diagnoses significantly and independently associated with low morale were depression, UTI and constipation. The experience of suffering from repeated UTI was described in interviews conducted with 20 old women. The interviews were analysed using qualitative content analysis. The participants described living with repeated UTI as being in a state of manageable suffering and being dependent on alleviation. Being in a state of manageable suffering was described in terms of experiencing physical and psychological inconveniences, struggling to deal with the illness and being restricted regarding daily life. Being dependent on alleviation was illustrated in terms of having access to relief but also experiencing receiving inadequate care. In conclusion, UTI is very common among old and very old women and is a serious health problem. UTI seems to be associated with delirium and to have a significant impact on the morale or subjective wellbeing of old women and those affected suffer both physically and psychologically and their social life is limited. UTI was also associated with vertebral fractures, urinary incontinence, inflammatory rheumatic disease and multi-infarct dementia which might raise the suspicion that UTI can have serious medical effects on health in old women.
  •  
10.
  • Eriksson, Irene, 1965-, et al. (creator_code:aut_t)
  • Urinary tract infection in very old women is associated with delirium
  • 2011
  • record:In_t: International psychogeriatrics. - : Cambridge University Press. - 1041-6102 .- 1741-203X. ; 23:3, s. 496-502
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Background: The aim of the study was to investigate whether urinary tract infection (UTI) in a representative sample of 85-, 90- and >/=95-year-old women is associated with delirium. Methods: In 504 out of 643 women (78.4%) it was possible to evaluate UTI and delirium. Assessments such as the Organic Brain Syndrome (OBS) Scale, the Geriatric Depression Scale-15 (GDS-15) and the Mini-mental State Examination (MMSE) were performed during home visits. Delirium, dementia and depression were diagnosed according to the DSM-IV criteria. A diagnosed, symptomatic UTI with or without ongoing treatment, documented in medical records or detected in association with the assessments, was registered. Results: Eighty-seven of 504 women (17.2%), were diagnosed as having a UTI with or without ongoing treatment when they were assessed, and almost half of them (44.8%) were diagnosed to be delirious or having had episodes of delirium during the past month. One hundred and thirty-seven of the 504 women (27.2%) were delirious or had had episodes of delirium during the past month and 39 (28.5%) of them were diagnosed to have a UTI. In a multivariate logistic regression model, delirium was significantly associated with Alzheimer's disease (OR = 5.8), multi-infarct dementia (OR = 5.4), depression (OR = 3.1), heart failure (OR = 2.3) and urinary tract infection (OR = 1.9).Conclusions: A large proportion of very old women with UTI suffered from delirium which might indicate that UTI is a common cause of delirium. There should be more focus on detecting, preventing and treating UTI to avoid unnecessary suffering among old women.
  •  
Skapa referenser, mejla, bekava och länka
  • navigation:Result_t 1-10 navigation:of_t 13

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt tools:Close_t

tools:Permalink_label_t